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Old 09-05-2005, 10:22 AM
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Added LED Brake Light,works only with lights off! Help!

Hey Ya'll, I bought an LED Brake Light to go in the back window of the '37. I connected the 2 wires to the 2 brake light wires in the boot. All was perfect and working, BUT when I turned on the Headlights, the new LED would not work, nor would the accessory brake light work located below the normal brake light. What did I do wrong, and how can I fix it?

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Old 09-05-2005, 07:47 PM
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Confused

Doc here,

Confused, what is the LED light for? Brake lights only, Brake/Turn, or tails..?

The LED only conducts in one direction..so you have to be sure all circuits have the same polarity..unlike a light bulb that will light either direction on the filament..

Tell me EXACTLY what it's function is, and what wires (where do they go ) they hook to, and I can help more..

Doc
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Old 09-05-2005, 08:07 PM
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Hey Doc. . .here's the scoop

Doc, thanks so much. The LED is a 3rd Brake Light only. There are 2 wires that come from this light; one black, one red. The car has 2 tail lights that act as tail lights and brakes lights. There is also another set of smaller lights underneath the tail of the car that are 'parking lights,' but also act as brake lights. So, we have 8 sets of wires: #1 Red/Black from new LED Brake Light. #2 Two Red/Red wires that come directly from the top main Brake Lights and #3 Two Black/Black Wires that come from the smaller lower Parking/Brake Lights. #4 The Hot/Ground Wire that originally feeds the DRIVER SIDE original Brake & Parking Lights. I spliced the new LED Hot wire into the hot wire original junction, and then spliced the ground into the original ground wire junction. As I said, when the headlights are OFF, everything works perfectly, but when the headlights are on, the new LED Brake Light does not work. How can I find out if 'all circuits have the same polarity?' Thanks Doc in advance for your help. Southern Smiles, Donna
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Old 09-05-2005, 08:20 PM
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Breeze,

Not sure how that can work the way you said.

Did it come with instructions?

Keep in mind the wire for the brake is the same wire for the turn signal. So I would think you need a wire coming from both lights to make it know what was was a brake signal and what was turn signal(to ignore).

It seems to me that there is something missing? I would think to work as a 3rd brake light it would need two wires and a ground.

Rich

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Old 09-05-2005, 08:36 PM
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The easy way..

Doc here

The most very simple way to do this is run a second wire DIRECT from the brake light switch...

In this manner, you Bypass the turn-signal in / out at the column that the (most) brake lights go through...

And ground the black wire..

Also this isolates it totally from the tail light system..

It sounds like you have the wrong black wire at the rear, (tails, or tails ground..which will back feed power when not loaded) allowing the lamp to function forward biased ---->|---, but not to when the lights (tails lit) Equal bias..putting the third light out..So you could check that if you want to troubleshoot it currently..however I would opt for a direct wire to the BL switch..

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Old 09-05-2005, 08:52 PM
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If its a simple (no logic) light, I am afraid you are going to have to do as doc says.

Starting to sound like it.

Rich
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Old 09-06-2005, 10:42 AM
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Is this an option?

Okay, Ya'll, thanks . . .now remember I'm not that 'electrical savy,' so we need to follow the easiest route. Slicing into the direct wire to the brakes would be the easiest, IF I can find it. Is this an option: Return the LED Brake Light and buy just a 'regular' parking light type light since LED's have to have the same polarity and regulars light bulbs do not. But would I run into the same problem since it is not on the main brake wire? Mmm, what about a quart mason jar with lightin' bugs in it??? LOL
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Old 09-06-2005, 10:58 AM
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Donna, you will have the same issue with a non LED light.

If you can get a wire up to the front then look for a switch near your brake pedal. It has two wires. One is hot all the time and the other is hot (12 volts) when you press down the petal. That is the wire you want to use.

Rich
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